Which among the following represents the graph between area of cross-section $\left(a\right)$ and resistance $\left(R\right)$ of different conducting wires which are made by same material having equal length. 

On what factors does the resistance of a conductor depends?

Write the S.I. unit of resistivity. An electric motor takes $5 \mathrm{A}$ from a $220 \mathrm{V}$ source. Determine the power of the motor and energy consumed in $2$ hours.